25650471989 has 8 divisors (see below), whose sum is σ = 25744024152. Its totient is φ = 25556961280.

The previous prime is 25650471961. The next prime is 25650471991. The reversal of 25650471989 is 98917405652.

It can be written as a sum of positive squares in 4 ways, for example, as 3103047025 + 22547424964 = 55705^2 + 150158^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25650471989 - 2²⁴ = 25633694773 is a prime.

It is a super-2 number, since 2×25650471989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25650471389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1783949 + ... + 1798269.

It is an arithmetic number, because the mean of its divisors is an integer number (3218003019).

Almost surely, 2^25650471989 is an apocalyptic number.

It is an amenable number.

25650471989 is a deficient number, since it is larger than the sum of its proper divisors (93552163).

25650471989 is a wasteful number, since it uses less digits than its factorization.

25650471989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20727.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 25650471989 in words is "twenty-five billion, six hundred fifty million, four hundred seventy-one thousand, nine hundred eighty-nine".